Abstract
Problem Statement (Relevance): The article gives an overview of published data attesting to the positive effect produced by serpentinite-magnesite from the Khalilovo field in the Orenburg Region on the performance indicators in sinter and pellets production. The article presents the results of research on sinter production. The authors looked at the sinter produced from iron ore coming from the Kursk Magnetic Anomaly and the serpentinite-magnesite from the Khalilovo field. The above were introduced into the sinter mix in the form of slurry at the rate of up to 12.13 kg/t during the pelletizing stage. Objectives: The objective is to improve the iron ore agglomeration process for better pelletizing and sintering and a greater sinter quality. Methods Applied: The research was conducted in a laboratory with the help of a 210 mm sinter pot. The raw materials used for the sinter production at Ural Steel JSC were taken for the lab experiments. The flow of the material, which was introduced as slurry during the pelletizing stage, varied from 0.5 to 1.5 % of dry mix by weight, which corresponds to the specific consumption of sinter of 3.94 to 12.13 kg/t. Originality: The research offers an original iron ore sintering process which involves the addition of serpentinite-magnesite mixed with water as slurry during the pelletizing stage resulting in better pelletizing and sintering. Findings: It was found that the increased consumption of serpentinite-magnesite resulted in the following gains: the pellet hardness increased by 53.46%, the vertical sintering velocity speed increased by 35.89%, the sinter yield increased by 6.53%, the specific productivity of the sinter plant by yield increased by 25.59%, the drop strength increased by 3.35 %, the impact strength increased by 22.32%. The higher flow of serpentinite-magnesite led to a 48.71% decrease of 0-1 mm material in the charge after pelletizition and a 16.03% decrease of abrasion resistance. Practical Relevance: The research proved the feasibily of using serpentinite-magnesite from the Khalilovo field as a sintering additive when introduced during pelletization mixed with water as slurry at the flow rate of up to 12.13 kg/t. The optimum consumption rate of the experimental additive for the Ural Steel site was found to be between 7.98 and 12.13 kg/t and need to be verified under actual production conditions.
Keywords
Sinter charge, pelletizing, agglomeration, sintering, serpentinite-magnesite.
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